2009/10/21 Mariano Martinez Peck <marianopeck@gmail.com>:
Hi folks. I was reading chapter 13 of PBE and there is something I don't understand.
In page 283 it says:
"Every metaclass is-a class, hence inherits from Class. Class in turn inherits from its superclasses, ClassDescription and Behavior."
page 278, rule 8, it says:
"Every metaclass inherits from Class and Behavior."
However, if I open a class browser, I see that Metaclass inherits from ClassDescription, not Class. So, I don't understand :(
Can anyone clarify me this?
The topmost superclass of Metaclass is a ProtoObject class (as for any other class). You can see it yourself: Metaclass superclass superclass superclass superclass now if you take a look, what is the class of the above object, you'll see: (Metaclass superclass superclass superclass superclass) class -> ProtoObject class and now: (ProtoObject class) superclass => Class so, lets roll things back.. ProtoObject class superclass => Class means that ProtoObject object is an instance of class, which inherits from Class. Or, since ProtoObject is class itself, then the 'ProtoObject class' expression should return a metaclass, then you can see that a most basic metaclass inherits from Class. and hence: "Every metaclass inherits from Class and Behavior."
Thanks
Mariano
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